Educational Insights Fluorescent Light Filters (Tranquil Blue), Set of 4 CREATE A CALM AND PLEASANT ENVIRONMENT: Create a calm and soothing classroom or office environment by decreasing glare and flickering from overhead fluorescent lights! REDUCE HARSH GLARE THAT CAUSES HEADACHES: Harsh glare and flickering lights can cause eyestrain, headaches, even anxiety. EASY INSTALLATION: Four fabric panels fit over standard ceiling fluorescent light fixtures with sturdy, sewn-in magnets, creating a soothing working environment. HEAT RESISTANT AND CERTIFIED SAFE: Includes four 2' x 4' heat-resistant Fluorescent Light Filter panels in tranquil blue, and Certificate of Conformance for flame retardancy.